{"trustable":false,"prependHtml":"\u003cstyle type\u003d\"text/css\"\u003e\n #problem-body \u003e pre {\n display: block;\n padding: 9.5px;\n margin: 0 0 10px;\n font-size: 13px;\n line-height: 1.42857143;\n word-break: break-all;\n word-wrap: break-word;\n color: #333;\n background: rgba(255, 255, 255, 0.5);\n border: 1px solid #ccc;\n border-radius: 6px;\n }\n\u003c/style\u003e\n","sections":[{"title":"","value":{"format":"HTML","content":"\u003chtml\u003e\n \u003chead\u003e\u003c/head\u003e\n \u003cbody\u003e\n \u003cdiv id\u003d\"problem-body\"\u003e \n \u003cp\u003e\u003cstrong\u003eBalanced\u003c/strong\u003e numbers have been used by mathematicians for centuries. A positive integer is considered a balanced number if:\u003c/p\u003e \n \u003cp\u003e1)\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; Every \u003cstrong\u003eeven \u003c/strong\u003edigit appears an \u003cstrong\u003eodd \u003c/strong\u003enumber of times in its decimal representation\u003c/p\u003e \n \u003cp\u003e2)\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; Every \u003cstrong\u003eodd \u003c/strong\u003edigit appears an \u003cstrong\u003eeven \u003c/strong\u003enumber of times in its decimal representation\u003c/p\u003e \n \u003cp\u003eFor example, 77, 211, 6222 and 112334445555677 are balanced numbers while 351, 21, and 662 are not.\u003c/p\u003e \n \u003cp\u003eGiven an interval [A, B], your task is to find the amount of balanced numbers in [A, B] where both \u003cstrong\u003eA and B are included.\u003c/strong\u003e\u003c/p\u003e \n \u003ch3\u003eInput\u003c/h3\u003e \n \u003cp\u003eThe first line contains an integer T representing the number of test cases.\u003c/p\u003e \n \u003cp\u003eA test case consists of two numbers A and B separated by a single space representing the interval. You may assume that 1 \u0026lt;\u003d A \u0026lt;\u003d B \u0026lt;\u003d 10\u003csup\u003e19\u003c/sup\u003e\u0026nbsp;\u003c/p\u003e \n \u003ch3\u003eOutput\u003c/h3\u003e \n \u003cp\u003eFor each test case, you need to write a number in a single line: the amount of balanced numbers in the corresponding interval\u003c/p\u003e \n \u003ch3\u003eExample\u003c/h3\u003e \n \u003cpre\u003e\u003cstrong\u003eInput:\u003c/strong\u003e\n2\n1 1000\n1 9\u003c/pre\u003e \n \u003cpre\u003e\u003cstrong\u003eOutput:\u003c/strong\u003e\n147\n4\u003c/pre\u003e \n \u003c/div\u003e\n \u003c/body\u003e\n\u003c/html\u003e"}}]}